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/****************************************************************************
* *
* mixer.h *
* Mixer Interface *
* *
****************************************************************************/
typedef struct _snd_mixer snd_mixer_t;
#ifdef __cplusplus
extern "C" {
#endif
int snd_mixer_open(snd_mixer_t **handle, char *name);
int snd_mixer_close(snd_mixer_t *handle);
int snd_mixer_poll_descriptor(snd_mixer_t *handle);
#ifdef __cplusplus
}
#endif
/*
* Simple (legacy) mixer API
*/
typedef enum _snd_mixer_channel_id {
SND_MIXER_CHN_FRONT_LEFT = 0,
SND_MIXER_CHN_FRONT_RIGHT,
SND_MIXER_CHN_FRONT_CENTER,
SND_MIXER_CHN_REAR_LEFT,
SND_MIXER_CHN_REAR_RIGHT,
SND_MIXER_CHN_WOOFER,
SND_MIXER_CHN_LAST = 31,
SND_MIXER_CHN_MONO = SND_MIXER_CHN_FRONT_LEFT
} snd_mixer_channel_id_t;
#define SND_MIXER_CHN_MASK_MONO (1<<SND_MIXER_CHN_MONO)
#define SND_MIXER_CHN_MASK_FRONT_LEFT (1<<SND_MIXER_CHN_FRONT_LEFT)
#define SND_MIXER_CHN_MASK_FRONT_RIGHT (1<<SND_MIXER_CHN_FRONT_RIGHT)
#define SND_MIXER_CHN_MASK_FRONT_CENTER (1<<SND_MIXER_CHN_FRONT_CENTER)
#define SND_MIXER_CHN_MASK_REAR_LEFT (1<<SND_MIXER_CHN_REAR_LEFT)
#define SND_MIXER_CHN_MASK_REAR_RIGHT (1<<SND_MIXER_CHN_REAR_RIGHT)
#define SND_MIXER_CHN_MASK_WOOFER (1<<SND_MIXER_CHN_WOOFER)
#define SND_MIXER_CHN_MASK_STEREO (SND_MIXER_CHN_MASK_FRONT_LEFT|SND_MIXER_CHN_MASK_FRONT_RIGHT)
#define SND_MIXER_SCTCAP_VOLUME (1<<0)
#define SND_MIXER_SCTCAP_JOINTLY_VOLUME (1<<1)
#define SND_MIXER_SCTCAP_MUTE (1<<2)
#define SND_MIXER_SCTCAP_JOINTLY_MUTE (1<<3)
#define SND_MIXER_SCTCAP_CAPTURE (1<<4)
#define SND_MIXER_SCTCAP_JOINTLY_CAPTURE (1<<5)
#define SND_MIXER_SCTCAP_EXCL_CAPTURE (1<<6)
typedef struct _snd_mixer_sid {
unsigned char name[60];
unsigned int index;
} snd_mixer_sid_t;
typedef struct _snd_mixer_simple_control_list {
unsigned int controls_offset; /* W: first control ID to get */
unsigned int controls_request; /* W: count of control IDs to get */
unsigned int controls_count; /* R: count of available (set) IDs */
unsigned int controls; /* R: count of all available controls */
snd_mixer_sid_t *pids; /* W: IDs */
char reserved[50];
} snd_mixer_simple_control_list_t;
typedef struct _snd_mixer_simple_control {
snd_mixer_sid_t sid; /* WR: simple control identification */
unsigned int caps; /* RO: capabilities */
unsigned int channels; /* RO: bitmap of active channels */
unsigned int mute; /* RW: bitmap of muted channels */
unsigned int capture; /* RW: bitmap of capture channels */
int capture_group; /* RO: capture group (for exclusive capture) */
long min; /* RO: minimum value */
long max; /* RO: maximum value */
char reserved[32];
union {
struct {
long front_left; /* front left value */
long front_right; /* front right value */
long front_center; /* front center */
long rear_left; /* left rear */
long rear_right; /* right rear */
long woofer; /* woofer */
} names;
long values[32];
} volume; /* RW */
} snd_mixer_simple_control_t;
typedef struct _snd_mixer_simple_callbacks {
void *private_data; /* may be used by an application */
void (*rebuild) (snd_mixer_t *handle, void *private_data);
void (*value) (snd_mixer_t *handle, void *private_data, snd_mixer_sid_t *id);
void (*change) (snd_mixer_t *handle, void *private_data, snd_mixer_sid_t *id);
void (*add) (snd_mixer_t *handle, void *private_data, snd_mixer_sid_t *id);
void (*remove) (snd_mixer_t *handle, void *private_data, snd_mixer_sid_t *id);
void *reserved[58]; /* reserved for future use - must be NULL!!! */
} snd_mixer_simple_callbacks_t;
#ifdef __cplusplus
extern "C" {
#endif
const char *snd_mixer_simple_channel_name(int channel);
int snd_mixer_simple_control_list(snd_mixer_t *handle, snd_mixer_simple_control_list_t *list);
int snd_mixer_simple_control_read(snd_mixer_t *handle, snd_mixer_simple_control_t *simple);
int snd_mixer_simple_control_write(snd_mixer_t *handle, snd_mixer_simple_control_t *simple);
int snd_mixer_simple_read(snd_mixer_t *handle, snd_mixer_simple_callbacks_t *callbacks);
#ifdef __cplusplus
}
#endif
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